Selectable Binary Glock: The G-S173

Two years ago, Nevada-based Franklin Armory broke SHOT Show by appearing at the event with the first commercial selector-switch-equipped slide with a companion two-position binary trigger for a 9mm striker-fired pistol. Set up especially for the Gen 3 Glock 17, it had all the G18-style aesthetic (while being NFA compliant) and a crowd-pleasing ability for binary fire – which allows the user to fire a round both on the pull of the trigger and the release.

The two-position selector. To cancel the release round on G-S173, simply move the selector lever located on the slide from binary to the “semi” position before releasing the trigger.

With some practice, 17-round mags ran dry in right around two seconds at SHOT Show 2022.

Rather than just “spray and pray” giggle time kinda fun on the range, such triggers have a very valid application. When used properly and with sufficient training, users will see much-reduced split times and produce tighter groupings, especially when running controlled pairs.

Fast forward to this week and Franklin Armory has released the G-S173 to the public– and I got one.

More in my column at Guns.com.

2 comments


  • Perfect if the shooting drill is ‘one on target, one in the ceiling’.


    • Its actually pretty controllable if you know what you are doing. Hot dogging on the range with no instruction would be bad, though (as is any gun)

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